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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Showing 1-5 of 16 Abstracts search results
Document:
SP151-01
Date:
July 1, 1994
Author(s):
W. P. Chamberlin and R. E. Weyers
Publication:
Symposium Papers
Volume:
151
Abstract:
The service life of latex-modified concrete and low-slump dense concrete bridge deck overlays is estimated by extrapolating historical performance data obtained from the results of field research and investigations conducted in the U.S. and Canada. The data suggest that when concrete removal criteria are based on half-cell potential rather than actual damage, when removal of chloride-contaminated concrete is extended to below the reinforcing bar, and when the substrate is sandblasted to remove microcracking prior to cleaning, a mean service life of 30 to 50 years is likely.
DOI:
10.14359/4382
SP151-10
S. Feliu, J. A. Gonzalez, and C. Andrade
On-site monitoring of the rate of corrosion of reinforcements is a priority task. There are various available devices for measuring I corr. Most of them entail a prior measurement of the {DELTA}E/{DELTA}I, which defines the polarization resistance (R p). However, direct estimations of R p from the {DELTA}E/{DELTA}I ratio are usually unfeasible with large structures because they provide an apparent polarization resistance (R p app) that differs to a greater or lesser extent from the true R p value depending on the experimental conditions. This paper analyzes the influence of some experimental factors (that is, the use of unconfined or guard ring-confined electric signals, the CE size, and the presence of active and passive areas in reinforcements) on the R p app accuracy of the I corr values derived from it. The more correct I corr values can be obtained by sensorized confinement of the electric signal applied with the aid of a guard ring and supplementary reference electrodes for monitoring the electric field confinement.
10.14359/4383
SP151
Editor: Richard E. Weyers
SP-151 The Philip D. Cady International Symposium was held in Minneapolis, Minnesota, on November 9 and 10, 1993. The symposium volume includes 15 papers on concrete bridges in aggressive environments. The papers address the performance, protection, assessment, and the repair and rehabilitation of concrete bridges. The performance papers include the corrosion protection afforded by concrete bridge deck overlays, corrosion in prestressed concrete bridges, and the use of calcium nitrite in field structures. Protection papers address the performance of silane sealers, coatings, and waterproofers. Condition assessment technologies include measuring the corrosion rate of steel in concrete and the diffusion of chloride ions in bridge decks with overlays. Experiences in the repair and rehabilitation of concrete bridges by practitioners is also presented. The Philip D. Cady Symposium was sponsored by ACI Committees 345, 222, 515, and 201.
10.14359/14191
SP151-13
S. K. Ojha
Describes investigation and design of repairs to the approach decks of the Verrazano Narrows Bridge in New York City. In addition, all the joints will be replaced, electric manholes and pull boxes will be rehabilitated, and new power and communications cables will be pulled. These bare concrete decks exhibit extensive deterioration in the form of spalls, cracks, leakage, and efflorescence. A total of approximately 787,000 square feet of deck area will be repaired; this includes approximately 150,000 square feet of deck replacement. Total estimated cost is $45 million, and the construction duration is 5 to 6 years.
10.14359/4366
SP151-14
R. S. Lanyi
Explains the technology developed by Alberta Transportation and Utilities for field prestressing repairs to precast, prestressed concrete bridge girders. This repair technique restores structural integrity quickly and cost effectively. Applications regarding high load impact damage and corrosion of prestressing strand are discussed, based on Reid Crowther's experience and application of this repair technique.
10.14359/4373
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